How can one distinguish between magnesium and aluminum alloys physically?

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To distinguish between magnesium alloys and aluminum alloys, a chemical analysis such as X-ray or emission spectroscopy is essential for determining the precise alloy composition. Physical characteristics can also provide insights; magnesium alloys typically exhibit higher strength-to-weight ratios and different thermal conductivity compared to aluminum alloys. Additionally, factors like yield strength, ultimate strength, elongation, corrosion behavior, and toughness are critical in differentiating the two materials. Understanding these properties is vital for selecting the appropriate alloy for specific applications.
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How would one go about distingushing between magnesium alloys and aluminum alloys (physical characteristics)?
 
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One would do a chemical analysis - e.g. X-ray or emission spectroscopy to determine precise alloy composition.

Other than that, one can look at strength (yield and ultimate), strength-to-weight ratio, elongation, thermal conductivity, corrosion behavior, toughness, . . .
 

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